Akwai dalilai da dama da ke karfafa iyaye su shirya don ƙididdigar juna. Wasu ma'aurata sun yi imani cewa yana da kyau a haifi 'ya'ya biyu a cikin rayuwarsu kuma kada suyi tunani game da wannan batu.
Wasu sun gaskata cewa ma'aurata da ma'aurata suna da dangantaka mai karfi da zasu taimake su a rayuwa su magance dukan matsaloli tare. Akwai irin matan da suke da matsala tare da tsara yara, wannan shine dalilin da yasa suke shirin tsara jarirai da yawa a nan gaba, don haka baza suyi amfani da albarkatun da albarkatu mai yawa a kan tsara yarinyar ba.
Hanya na hawan ma'aurata ko ma'aurata sun fi girma ga mata masu biyowa:
- a cikin matan da ke cin abinci mai dadi. Akwai wasu mutane da al'ummomi a cikin tarihin, wanda haihuwar tagwaye da ma'aurata wata ƙa'idar girma ce ta sauran. Daga cikin su akwai wata kabilar da ke da babban yawa na mai dadi dankali (yams) a cikin abinci. Masana kimiyya suna da ra'ayi cewa dankalin turawa ya ƙunshi irin wannan kwayar halitta wadda ke inganta tunanin mahaifi da tagwaye;
- a cikin mata, lokacin shan nono. Masana kimiyyar kimiyya sun gudanar da bincike kuma sun kammala cewa fahimta a yayin yaduwar nono yana ƙaruwa da samun jima'i da tagwaye. Wannan hujja ta bayyana cewa kwayar cutar mace mai cin gashin kanta ta gajiyar da cewa zai iya shafar jaririn a lokacin tsarawa da kuma tsarin kwayoyin halitta;
- a cikin tsofaffin mata. Masana kimiyya sun cancanta cewa macen tsofaffi, mafi mahimmanci cewa tana da hanyoyi masu yawa. Dalilin wannan abu shine ƙara yawan kwayoyin halitta da yawa, wanda zai iya taimakawa wajen bayyanar ma'aurata binary;
- a cikin mata masu da 'yan'uwa maza biyu. Halin yiwuwar haihuwar tagwaye a cikin iyayensu masu zuwa nan gaba yafi girma a cikin wasu. Amma, da rashin alheri, ba shi yiwuwa a tasiri wannan tsari;
- a cikin matan da aka haife su a haifaffan ma'aurata da ma'aurata. Idan kun kasance a cikin iyali, musamman ma a tsakanin mahaifiyar, mahaifi da juna biyu ana haife su, to, yiwuwar haihuwar irin wannan yaran yana da girma;
- a cikin mata na wasu ƙasashe. Akwai hujjojin kimiyya cewa Afro-meerikanoks sun fi samun tagwaye da ma'aurata fiye da mata na sauran ƙasashe;
- a cikin matan da suka dauki magunguna na musamman da suka taimaka wajen kara yawan haihuwa. Wasu likitocin sun rubuta wa iyayensu masu zuwa da suke son ma'aurata ko ma'aurata, magungunan ƙwayoyi da suka inganta da'awar haihuwa. Samun irin wa] annan likitoci zai kasance da wuya a gare ka, domin idan ka yi irin wannan kwayoyi, akwai hadari na cutar da lafiyarka, don haka ya fi kyau ka ki yin amfani da irin wannan magungunan. Yana da kyau a nemi sauran hanyoyin;
- a cikin mata da suke gudanar da farfadowa mai kyau. An tsara wajibi ne kawai ga wadanda basu da ciki. Duk da haka, irin waɗannan ka'idodin suna ƙara yawan chances na haihuwar ma'aurata biyu, amma har ma da tsaunuka.
Sabili da haka, don yin juna biyu da ma'aurata, dole ne mutum ya hadu da ɗaya daga cikin waɗannan ka'idodin, ko kuma tuntuɓi cibiyar kiwon lafiya da ke hulɗar da farfadowa mai kyau.